Types of surface epithelial tissue
simple squamous epithelium
- a single layer of flat cells with disc shaped nucleus
-all the cells are in contact with the basement membrane
simple cuboidal epithelium
kidney salivary glands and pancreas
simple columnar epithelium
a single layer of rectangular cells some may contain cilia on the apical surface
some may have goblet cells
the digestive tract( stomach to anal), gallbladder and ducts of some glands(nonciliated) lines the small bronchi, unterine tubes and uterus(ciliated)
secrets mucus, enzymes and
ciliated cells propels the mucus or reproductive cells by ciliary action
Secrets lubricants into the serosa passage of materials by passive diffusion and filtration
single layer of cube like cells with a spherical nucleus in the center
secretion and absorption
stratified squamous epithelium
consists of several layers. Basal cells are cuboidal or columnar and the apical cells are squamous . Can be keratinized or nonkeratinized
the body surface (epidermis) (keratinized)
forms the moist ling of the oesophagus, mouth , vagina and anal canal (non-keratinized)
to protect the underylying tissues that are subject to abrasion ( protects against mechanical damage)
2 layers of cube like cells
Stratified cuboidal epithelium
largest ducts of the sweat glands mammary glands and salivary glands
Protection
Stratified columnar epithelium
2 layers of cells - basal cells are cuboidal while the surface cells are columnar
largest ducts of some glands ,male urethra
secretion and protection
a single layer of cells of varying heights only the tall ones reach the surface nuclei are located at various heights giving a false impression of stratification may contain goblet cells or cilia
Pseudostratified Columnar epithelium
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ducts of the male reproductive organs and trachea
secretion and propelling of the mucus
Transitional epithelium
basal layer is cuboidal or columnar while the surface layer is squamous
lines the ureters, urinary bladder and the urethra
Allows the stretching and expansion of the urinary bladder
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